<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
</head>
<body>

<p id="p1">Hello world!</p>
<p id="p2">Hello world!</p>

<script>
    document.getElementById("p2").style.color="blue";
    document.getElementById("p2").style.fontFamily="Arial";
    document.getElementById("p2").style.fontSize="larger";
</script>

</body>
</html>